Did you go into the Mission? Or Hayes Valley? Or over by Jtown? And god help you if there is any sort of Event nearby. During the maker faire every iphone read "5 bars" but no one could get their iPhones to do anything. Oh sure, it said it was sending texts and trying to make calls, it said it was trying to load webpages, but it all failed.
We Are Not Making This Up; and it's not just iPhone customers.